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<h1 class="topictitle1">An Internal Error Occurs During the Subjob of a Backup Job</h1>
<div><div class="section"><h4 class="sectiontitle">Symptom</h4><p>An incremental, differential, or log backup job fails for GaussDB T, and a message indicating an internal error is displayed in the job details area on OceanProtect GUI.</p>
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<div class="section"><h4 class="sectiontitle">Possible Cause</h4><p>The system time of the host where the client is installed has been changed for multiple times. As a result, the copy time is disordered, and the system fails to query the latest copy.</p>
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<div class="section"><h4 class="sectiontitle">Troubleshooting</h4><ol><li><span>Log in to the database host where the backup fails and use Roach to perform a full backup.</span></li><li><span>After the full backup is successful, use Roach to perform an incremental backup.</span><p><ul><li>If the full backup fails and a message indicating that the latest full copy cannot be found and full backup needs to be performed again is displayed, perform <a href="#EN-US_TOPIC_0000002164601030__li237226172110">3</a>.</li><li>If the backup fails and other messages are displayed, contact Huawei technical support engineers.</li></ul>
</p></li><li id="EN-US_TOPIC_0000002164601030__li237226172110"><a name="EN-US_TOPIC_0000002164601030__li237226172110"></a><a name="li237226172110"></a><span>Check whether the time of all GaussDB T hosts is consistent.</span><p><ul><li>If no, change the host time to ensure that the time of all GaussDB T hosts is consistent.</li><li>If yes, perform <a href="#EN-US_TOPIC_0000002164601030__li3919544132113">4</a>.</li></ul>
</p></li><li id="EN-US_TOPIC_0000002164601030__li3919544132113"><a name="EN-US_TOPIC_0000002164601030__li3919544132113"></a><a name="li3919544132113"></a><span>Find all previously generated copies and use Roach to delete all of them.</span></li><li><span>On the OceanProtect WebUI, manually perform a full backup again and then perform an incremental backup again.</span><p><ul><li>If the incremental backup succeeds, no further action is required.</li><li>If the incremental backup fails, contact Huawei technical support.</li></ul>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_0000002199967361.html">FAQs</a></div>
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